JP2011118008A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device having a water-proof function by which the occurrence of cloudiness caused by dew condensation is prevented in a simple constitution. <P>SOLUTION: The display device 100 having a water-proof function, includes a liquid crystal unit 110 as a display unit, a case 120, and a transparent panel 150. The case 120 includes a front case 130 having an annular plane part 134 forming an aperture part 136. The transparent panel 150 is arranged ahead of a display plane D on which an image is display by the liquid crystal unit 110 and the annular plane part 134. A part of the liquid crystal unit 110 including the display plane D is inserted into the aperture part 136. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display device having a waterproof function (waterproof structure).

  Display devices are widely used. Some display devices are used outdoors and / or indoors in an environment where water is present. For example, some are used in the bathroom or on the ship. In such a case, a waterproof function is added to the display device. In other words, the display device has a waterproof function. As a display device having a waterproof function, a liquid crystal unit, a housing that contains and holds and protects the liquid crystal unit, and a transparent protective panel that is disposed at a predetermined interval in front of the liquid crystal unit are provided. There has been proposed a liquid crystal display device in which a porous sealing material is provided between the casing and the protective panel. According to this liquid crystal display device, it is said that the occurrence of condensation can be prevented while realizing dustproof and waterproof properties (see, for example, Patent Document 1).

JP 2005-309268 A

  By the way, when the display device is used in an environment where outdoor and / or indoor water exists, the temperature inside the display device rises and the temperature of the air present inside the display device rises. In such a state, when cold water or the like is applied to the transparent panel provided in front of the display surface of the display device (the “protective panel” corresponds to this in Patent Document 1), the space between the transparent panel and the display surface. The existing air is suddenly cooled, and condensation occurs on the inner surface of the transparent panel, which may cause fogging.

  An object of the present invention is to provide a display device having a waterproof function that can prevent fogging due to condensation with a simple configuration.

  One aspect of the present invention is a display device having a waterproof function, which includes a display unit, a case portion having an annular flat portion that forms an opening, a display surface on which an image is displayed on the display unit, and the annular flat surface. A display panel, wherein a part of the display unit including the display surface is inserted into the opening. According to this, the space between the display surface and the protective panel can be reduced, and the amount of air existing in this space can be reduced.

  In another aspect of the present invention, the display surface is disposed in a plane including the annular flat surface portion in a state where a part of the display unit is inserted into the opening. According to this, the space between the display surface and the protection panel can be further reduced, and the amount of air existing in this space can be further reduced.

  In another aspect of the present invention, the display surface is disposed so as to protrude from the annular flat portion toward the transparent panel in a state where a part of the display unit is inserted into the opening. And According to this, the space between the display surface and the protection panel can be further reduced, and the amount of air existing in this space can be further reduced.

  In another aspect of the present invention, a cushion material is installed on a portion of the display unit that faces the transparent panel and surrounds the display surface, and the cushion material is installed in the state in which the transparent panel is installed. The unit is compressed by the transparent panel. According to this, the circulation of air existing in the space between the display surface and the protection panel can be blocked.

  ADVANTAGE OF THE INVENTION According to this invention, the display apparatus which has a waterproof function which can prevent generation | occurrence | production of the cloudiness by dew condensation with a simple structure can be obtained.

(A) is a front view of a display apparatus, (b) is AA sectional drawing of Fig.4 (a). It is a figure which shows the result of a dew condensation test. (A) is a front view of another display apparatus, (b) is BB sectional drawing of Fig.4 (a).

  Embodiments according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to the configurations described below, and various configurations can be employed in the same technical idea. For example, in each configuration described below, a predetermined configuration can be omitted.

(Display device)
The display device 100 is a liquid crystal display device having a shape as shown in FIG. 1 and including a liquid crystal unit 110 as a display unit. The liquid crystal unit 110 includes one part (hereinafter, also referred to as “display unit”) including a display surface D for displaying an image. Various electrical circuits (electronic components) for operating the liquid crystal unit 110 are provided on the back side of the display unit (opposite the display surface D) of the liquid crystal unit 110. In the display device 100, the liquid crystal unit 110 that has been conventionally used can be adopted as the liquid crystal unit 110, and a detailed description thereof will be omitted.

  In addition to the liquid crystal unit 110, the display device 100 includes a case 120, a transparent panel 150, a cushion material 160, and an adhesive material 170. The case 120 has a divided structure, and includes a front case 130 and a rear case 140. The front case 130 is formed by a side wall portion 132 and an annular flat surface portion 134. The annular flat surface portion 134 is formed on the inner peripheral side of the side wall portion 132, and the side wall portion 132 and the annular flat surface portion 134 have a vertical (including substantially vertical) positional relationship. The annular flat surface portion 134 forms an opening 136 in which the display portion of the liquid crystal unit 110 is inserted and arranged at the center. In other words, the annular flat surface portion 134 is an annular flat surface portion provided with an opening 136 formed at the center of a plane perpendicular to (including substantially vertical to) the side wall portion 132 on the inner peripheral side of the side wall portion 132. is there. The opening 136 has a shape that is larger than the outer shape of the display unit and is similar to the outer shape.

  The rear case 140 has a bottomed cylindrical shape. The front case 130 and the rear case 140 are integrally formed by injection molding of a predetermined resin, respectively. The front case 130 and the rear case 140 are assembled by a predetermined method. In a state where the front case 130 and the rear case 140 are assembled, airtightness is secured by a predetermined method at a joint portion between the two, thereby ensuring a waterproof function of the display device 100. In the space S formed by assembling the front case 130 and the rear case 140, the liquid crystal unit 110 is accommodated with the display unit inserted into the opening 136 and attached by a predetermined method. In a state where the display unit is inserted into the opening 136, a slight gap t <b> 1 with a constant interval is formed between the display unit and the annular flat surface unit 134.

  In a state where the display unit is inserted into the opening 136 and the liquid crystal unit 110 is attached, the display surface D is disposed in a plane including the annular plane unit 134. For example, as shown in FIG. 1B, the display surface D is arranged in a plane H2 (virtual plane) including a plane H1 that forms the annular plane portion 134.

  The transparent panel 150 is formed of a transparent plate made of, for example, glass, acrylic, or polycarbonate. The outer shape of the transparent panel 150 has a shape similar to this shape, which is smaller than the shape of the inner periphery of the side wall portion 132. The transparent panel 150 is attached to the inner peripheral side of the side wall portion 132 and is installed in front of the display surface D and the annular flat surface portion 134.

  A cushioning material 160 is formed in a portion of the liquid crystal unit 110 that surrounds the display surface D, that is, a predetermined portion of the liquid crystal unit 110 that is the outer periphery of the display unit including the display surface D so as to surround the outer edge of the display surface D In particular, it is affixed. Further, the adhesive material 170 is attached to the flat surface H1 of the annular flat surface portion 134 over the entire circumference. The adhesive material 170 is formed of a material having a cushioning property like the cushion material 160. In a state where the transparent panel 150 is installed on the inner peripheral side of the side wall portion 132, the inner surface of the transparent panel 150 (the surface on the inner side of the display device 100) is in contact with the cushion material 160 and the adhesive material 170. The cushion material 160 and the adhesive material 170 are compressed by the contact with the transparent panel 150. Thereby, the airtightness in this part is ensured, and the waterproof function of the display device 100 in this part is suitably secured. Note that the gap between the inner surface of the transparent panel 150 and the display surface D and the gap between the inner surface of the transparent panel 150 and the plane H1 of the annular flat surface portion 134 are set to a gap t2.

  Here, according to the display device 100, the circulation of air existing in the space between the display surface D and the inner surface of the transparent panel 150 can be blocked. That is, the space between the display surface D and the inner surface of the transparent panel 150 is a narrow space closed by the compressed cushion material 160, and is between the space inside the display device 100, for example, the space S inside the case 120. The air flow is blocked by the compressed cushion material 160. Thereby, it is possible to more suitably prevent the occurrence of condensation on the inner surface of the transparent panel 150 and prevent the occurrence of fogging.

  The display device 100 can be used indoors and / or outdoors where a waterproof function is required. For example, the display device 100 can be used in a bathroom. In this case, the display device 100 is installed on the wall of the bathroom. The display device 100 can be used as a portable display device used outdoors. Furthermore, the display device 100 can be used as a display device for a fish finder installed on a ship. In this case, the display device 100 is attached to the ship.

(Experimental result)
The above-described display device 100 of the present embodiment (referred to as “the present embodiment product” in the description of experimental results) and two display devices available in the market (hereinafter referred to as “comparative product 1” and “comparative product 2”). )) Was conducted on the occurrence of cloudiness due to condensation. Hereinafter, this result will be described.

  First, an outline of the experimental method will be described. The three display devices of the present embodiment product and the comparison products 1 and 2 are operated for a certain time in an environment of 50 ° C., and then, the transparent panel 150 of the present embodiment product and the transparent panels of the comparison products 1 and 2 are A cloudy state due to condensation was observed by applying cold water at 0 ° C.

  The experimental results will be described with reference to FIG. 2, (a) shows the state of the product of the present embodiment, (b) shows the state of the comparative product 1, and (c) shows the state of the comparative product 2. As apparent from FIG. 2, in the product of this embodiment, no condensation occurs on the inner surface of the transparent panel 150, and no fogging occurs. On the other hand, in Comparative products 1 and 2, significant dew condensation occurred on the inner surface of the transparent panel, resulting in cloudiness.

  As is clear from the above results, fogging due to condensation occurring in the comparative products 1 and 2 can be prevented in the present embodiment product. In other words, the user who uses the display device 100 of the present embodiment uses the image displayed on the display surface D even when cold water is applied when the display device 100 is used (operated). , And can be viewed continuously.

(Modification)
The display device 100 of the present embodiment can be configured as follows.

  (1) In the above description, the display device 100 including the liquid crystal unit 110 as a display unit has been described as an example. Various types of display units can be used. For example, in addition to the liquid crystal unit 110, a plasma display or an organic EL (Electro-Luminescence) can be employed.

  (2) In the above, the display device 100 including the case 120 including the front case 130 and the rear case 140 has been described as an example. In addition to such a configuration, the case 120 may be an integrated configuration without adopting a divided structure, for example. Moreover, it can also be set as the structure of 3 or more divisions. In addition, when it is set as a division structure, in order to ensure the waterproof function of the display apparatus 100, airtightness is ensured by the predetermined method in the joining location of each part like the above.

  (3) In the above description, the display device 100 in which a certain slight gap t1 is formed between the display unit and the annular flat surface part 134 in a state where the display unit is inserted into the opening 136 has been described as an example. . In addition to such a configuration, the shape of the opening 136 is substantially the same as the shape of the display unit, and the display unit and the annular flat surface unit 134 are fitted with the display unit inserted into the opening 136. It can also be set as such a structure.

  (4) In the above description, the configuration in which the display surface D is arranged in the plane including the annular plane portion 134 is the same as the plane H2 (virtual plane) including the plane H1 in which the display surface D forms the annular plane portion 134. The arrangement is described as an example. Here, the configuration in which the display surface D is arranged in a plane including the annular flat surface portion 134 may be different from this.

  That is, the configuration in which the display surface D is arranged in the plane including the annular flat surface portion 134 is a predetermined area between the flat surface H2 and the plane H4 including the flat surface H3 opposite to the flat surface H1 forming the annular flat surface portion 134. It can also be set as the structure by which the display surface D was installed in the plane of a position (plane parallel to the plane H2 and the plane H4). In this case, the liquid crystal unit 110 is arranged in the X direction from the position shown in FIG. 1 (see the arrow “X” in FIG. 1) so that the display surface D is arranged in a plane at a predetermined position between the plane H2 and the plane H4. ) Is attached at a predetermined position.

  (5) In the above description, the display device 100 in which the display surface D is arranged in a plane including the annular plane portion 134 has been described as an example. In addition to such a configuration, the display device 100 may be configured as shown in FIG. In other words, the display surface D may be the display device 200 disposed so as to protrude from the annular flat surface portion 134 toward the transparent panel 150 in a state where the display portion is inserted into the opening 136. In FIG. 3, the same components as those in FIG. 1 are denoted by the same reference numerals. Hereinafter, detailed description of the same configuration is omitted.

  In the display device 200, the gap t3 between the inner surface of the transparent panel 150 and the display surface D is narrower than the gap t2 between the inner surface of the transparent panel 150 and the plane H1 of the annular flat surface portion 134. The thickness or compression rate is set according to each of the gaps t2 and t3. In the display device 200, the liquid crystal unit 110 is attached such that the display surface D is disposed so as to protrude from the annular flat surface portion 134 toward the transparent panel 150. The cushion material 160 may be omitted, and the display surface D and the inner surface of the transparent panel 150 may be configured to contact (substantially contact). Also with the display device 200 of the modification (5), the same operation (function) and effect as those of the display device 100 can be achieved.

  (6) In the above description, the display device 100 including the cushion material 160 has been described as an example. Under various conditions, the cushion material 160 may be omitted. With the configuration in which the display unit is inserted into the opening 136 formed by the annular flat surface part 134, the space between the display surface D and the transparent panel 150 can be reduced, and the amount of air existing in this space can be reduced. can do. Therefore, for example, it may be possible to prevent the occurrence of condensation in a display device in which the display unit is not inserted into the opening.

DESCRIPTION OF SYMBOLS 100,200 Display apparatus 110 Liquid crystal unit 120 Case 130 Front case 134 Annular plane part 136 Opening part 150 Transparent panel 160 Cushion material D Display surface

Claims (4)

A display device having a waterproof function,
A display unit;
A case portion having an annular flat surface portion forming an opening;
A display surface on which an image is displayed on the display unit and a transparent panel installed in front of the annular flat surface portion,
A part of the display unit including the display surface is inserted into the opening.   2. The display device according to claim 1, wherein the display surface is arranged in a plane including the annular plane portion in a state where a part of the display unit is inserted into the opening.   2. The display device according to claim 1, wherein the display surface is disposed so as to protrude from the annular flat portion toward the transparent panel in a state where a part of the display unit is inserted into the opening. Display device. A cushion material is installed on the portion of the display unit that faces the transparent panel and surrounds the display surface,
The display device according to claim 1, wherein the cushion material is compressed by the display unit and the transparent panel in a state where the transparent panel is installed. .